Halo Campaign Evolved is a large-scale sci-fi shooter that adapts the original conflict between humanity and the Covenant to modern technological standards. The transition to Unreal Engine 5 allowed for a complete overhaul of the visuals, updated story scenes, and re-recorded audio featuring the original actors. The story of Master Chief's survival on the mysterious ring world is now complemented by three backstories, revealing details of the covert Operation Meteor.